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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,584.8 | $ 5,248.9 | $ 12,946.1 | $ 15,666.9
Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,513.2 | 5,148.5 | 12,719.9 | 15,332.7
Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 71.6 | 100.4 | 226.2 | 334.2
Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,036.9 | 4,670.4 | 11,326.7 | 13,882.5
Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 359.5 | 360.2 | 1,059.9 | 1,088.3
Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 102.0 | 137.6 | 321.7 | 445.6
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 86.4 | 80.7 | 237.8 | 250.5
Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 929.1 | 1,094.5 | 2,776.7 | 3,192.9
Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 915.2 | 1,076.3 | 2,735.9 | 3,139.7
Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.9 | 18.2 | 40.8 | 53.2
Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 578.8 | 666.4 | 1,705.6 | 1,942.3
Americas | United States | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 567.6 | 652.8 | 1,673.0 | 1,902.0
Americas | United States | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.2 | 13.6 | 32.6 | 40.3
Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 350.3 | 428.1 | 1,071.1 | 1,250.6
Americas | Other Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 347.6 | 423.5 | 1,062.9 | 1,237.7
Americas | Other Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2.7 | 4.6 | 8.2 | 12.9
Americas | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 810.2 | 969.1 | 2,444.6 | 2,827.3
Americas | Staffing and Interim | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 478.2 | 564.5 | 1,425.9 | 1,644.5
Americas | Staffing and Interim | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 332.0 | 404.6 | 1,018.7 | 1,182.8
Americas | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 43.9 | 52.1 | 124.2 | 151.2
Americas | Outcome-Based Solutions and Consulting | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 33.0 | 38.5 | 93.6 | 111.8
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10.9 | 13.6 | 30.6 | 39.4
Americas | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25.3 | 31.9 | 74.7 | 90.9
Americas | Permanent Recruitment | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21.3 | 25.2 | 62.1 | 72.2
Americas | Permanent Recruitment | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4.0 | 6.7 | 12.6 | 18.7
Americas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 49.7 | 41.4 | 133.2 | 123.5
Americas | Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46.3 | 38.2 | 124.0 | 113.8
Americas | Other | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.4 | 3.2 | 9.2 | 9.7
Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,112.4 | 2,357.8 | 5,527.9 | 6,860.9
Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,090.6 | 2,326.4 | 5,457.8 | 6,758.8
Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21.8 | 31.4 | 70.1 | 102.1
Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,205.3 | 1,386.4 | 3,035.1 | 4,117.8
Southern Europe | France | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,196.4 | 1,375.1 | 3,008.0 | 4,080.1
Southern Europe | France | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.9 | 11.3 | 27.1 | 37.7
Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 351.2 | 376.9 | 947.4 | 1,127.7
Southern Europe | Italy | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 345.6 | 369.6 | 929.7 | 1,101.2
Southern Europe | Italy | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5.6 | 7.3 | 17.7 | 26.5
Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 555.9 | 594.5 | 1,545.4 | 1,615.4
Southern Europe | Other Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 548.6 | 581.7 | 1,520.1 | 1,577.5
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7.3 | 12.8 | 25.3 | 37.9
Southern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,911.7 | 2,158.8 | 4,932.0 | 6,243.1
Southern Europe | Staffing and Interim | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,119.8 | 1,309.8 | 2,781.5 | 3,880.0
Southern Europe | Staffing and Interim | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 335.1 | 354.9 | 897.2 | 1,050.1
Southern Europe | Staffing and Interim | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 456.8 | 494.1 | 1,253.3 | 1,313.0
Southern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 166.4 | 150.0 | 486.3 | 453.1
Southern Europe | Outcome-Based Solutions and Consulting | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 72.4 | 57.4 | 213.0 | 174.5
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7.0 | 10.4 | 20.7 | 32.1
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 87.0 | 82.2 | 252.6 | 246.5
Southern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24.5 | 35.6 | 78.8 | 114.5
Southern Europe | Permanent Recruitment | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.8 | 12.1 | 29.7 | 40.2
Southern Europe | Permanent Recruitment | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.0 | 8.1 | 19.0 | 28.7
Southern Europe | Permanent Recruitment | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.7 | 15.4 | 30.1 | 45.6
Southern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.8 | 13.4 | 30.8 | 50.2
Southern Europe | Other | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.3 | 7.1 | 10.9 | 23.1
Southern Europe | Other | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.1 | 3.5 | 10.5 | 16.8
Southern Europe | Other | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.4 | 2.8 | 9.4 | 10.3
Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 947.7 | 1,166.8 | 2,881.9 | 3,561.4
Northern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 928.3 | 1,137.6 | 2,818.3 | 3,465.8
Northern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 19.4 | 29.2 | 63.6 | 95.6
Northern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 845.7 | 1,037.2 | 2,563.6 | 3,141.4
Northern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 63.2 | 79.6 | 198.5 | 259.4
Northern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22.2 | 33.5 | 73.1 | 109.8
Northern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 16.6 | 16.5 | 46.7 | 50.8
APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 595.6 | 629.8 | 1,759.6 | 2,051.7
APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 579.1 | 608.2 | 1,707.9 | 1,968.4
APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 16.5 | 21.6 | 51.7 | 83.3
APME | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 469.3 | 505.3 | 1,386.5 | 1,670.7
APME | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 86.0 | 78.5 | 250.9 | 224.6
APME | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 30.0 | 36.6 | 95.1 | 130.4
APME | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 10.3 | $ 9.4 | $ 27.1 | $ 26.0

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